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Shiny Cowbird

Molothrus bonariensis
(Gmelin, JF, 1789)
Tordo Renegrido
Chupim

Family: Icteridae
Order: Passeriformes
Class: Aves
Phylum / Division: Chordata
Kingdom: Animalia

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Conservation status according to BirdLife International: Least Concern

Description: It is a medium-sized bird with a robust build and upright posture, showing clear sexual dimorphism. The male displays glossy black plumage with bluish or purplish iridescence, while the female is much duller, with brownish to grayish tones and fine streaking. The bill is short, strong, and conical, suited to a varied diet, and the dark eyes give it an alert expression.

Geographic distribution: It is widely distributed throughout South America, with natural and human-facilitated expansion into Central America and parts of the Caribbean. It is one of the most widespread species within its genus.

Habitat: It primarily inhabits open and semi-open environments, such as grasslands, farmland, rural areas, city outskirts, and urban parks. Its high tolerance for human-altered landscapes has greatly contributed to its geographic expansion.

Feeding: This species is omnivorous, feeding mainly on seeds, grains, and small invertebrates such as insects and larvae. It often forages on the ground, alone or in groups, frequently taking advantage of resources associated with livestock and agriculture.

Behavior: It is a gregarious and opportunistic species, commonly seen in flocks, especially outside the breeding season. It shows confident and adaptable behavior, often frequenting areas with intense human activity. During reproduction, females exhibit particularly stealthy behavior.

Nesting: It has a distinctive reproductive strategy known as brood parasitism, as it does not build its own nest. Females lay their eggs in the nests of other bird species, which then incubate the eggs and raise the chicks. The young often grow rapidly and may outcompete or displace the host’s offspring.

Conservation status: It is classified as Least Concern, due to its wide distribution, large population size, and strong adaptability. No significant global threats are currently identified.


Author of this compilation: EcoRegistros – 22/12/2025




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Last published photographs

Foto
Photography ID: 672417
  Adult

La Carolina
San Luis
Argentina
01/22/2026
Manuel Godoy
Foto
Photography ID: 669999
  Adult

Lujan
San Luis
Argentina
01/19/2026
Manuel Godoy
Foto
Photography ID: 658181
  Adult

Pantanal
Mato Grosso
Brazil
09/15/2025
Manuel Godoy
Foto
Photography ID: 657856
  Adult

Pantanal
Mato Grosso
Brazil
09/15/2025
Manuel Godoy
Foto
Photography ID: 653273
  Adult

Transpantaneira
Mato Grosso
Brazil
09/11/2025
Manuel Godoy
Foto
Photography ID: 647176
  Adult

Ciudad de Mendoza
Mendoza
Argentina
08/06/2025
Manuel Godoy
Foto
Photography ID: 618060
  Adult

Papudo
Región de Valparaíso
Chile
01/05/2025
Manuel Godoy
Foto
Photography ID: 588293
♂ ♀
  Adult

Godoy Cruz
Mendoza
Argentina
06/15/2024
Manuel Godoy
Foto
Photography ID: 511528
  Adult

Parque Provincial Potrero de Yala
Jujuy
Argentina
10/07/2022
Manuel Godoy
Foto
Photography ID: 461932
  Adult

General Conesa
Río Negro
Argentina
09/04/2021
Manuel Godoy
Foto
Photography ID: 371098
  Adult

Necochea
Buenos Aires
Argentina
01/01/2020
Manuel Godoy



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 Reports


 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
243124622/01/2026ArgentinaSan LuisCiudad, La CarolinaManuel Godoy
242367619/01/2026ArgentinaSan LuisReserva Privada Punta del Agua, LujanManuel Godoy
238027915/09/2025BrazilMato GrossoTranspantaneira, PantanalManuel Godoy
238049215/09/2025BrazilMato GrossoPorto Jofre, PantanalManuel Godoy
236746311/09/2025BrazilMato GrossoTranspantaneiraManuel Godoy
233888306/08/2025ArgentinaMendozaParque General San Martin, Ciudad de MendozaManuel Godoy
223194005/01/2025ChileRegión de ValparaísoCaballerizas, PapudoManuel Godoy
204794315/06/2024ArgentinaMendozaCementerio Parque Oasis de Paz, Godoy CruzManuel Godoy
203092413/10/2023ChileRegión del Libertador Bernardo O´HigginsReserva Nacional, Reserva Nacional Río Los CipresesManuel Godoy
166224107/10/2022ArgentinaJujuyLaguna del Rodeo, Parque Provincial Potrero de YalaManuel Godoy
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 18/04/2026.